Cover and cook 3.5 hours on high, or 8-9 hours on low. Don't open the cooker! It lowers the temp and prolongs cooking time. Don't stir - it's doing fine.

To serve beautifully: remove roast, snip and remove string. Carve slices and lay on platter, cover with veges and broth. Remaining broth can be mixed with a little flour (and water if necessary), and heated to make a gravy. Pour over or serve on the side.